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| 51. | The unoccupied orbital are called virtual orbitals. |
| 未占轨道叫虚轨道。 |
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| 52. | The moon doesn't describe a circle round the earth, but rather an ellipse. |
| 月球绕地球运行的轨道不是浑圆的，而是椭圆的。 |
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| 53. | On this mission the shuttle will orbit at a height of several hundred miles. |
| 此次任务中，这架航天飞机将在数百英里高空的轨道运行。 |
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| 54. | osculating orbit |
| 密切轨道;吻切轨道 |
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| 55. | The first spacecraft entered the orbit around Venus and remains in that orbit making observations. |
| 其中一艘太空船进入金星运行轨道，留在那里从事观察工作。 |
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| 56. | orbit modification |
| 轨道变更|轨道修正 |
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| 57. | track elevation |
| 轨道升高|轨道高程 |
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| 58. | track conjunction |
| 轨道联结|轨道连结点 |
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| 59. | H-II Orbiting Plane H-I |
| 轨道飞机(轨道飞机) |
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| 60. | orbital elements |
| 轨道根数;轨道元 |
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